1 like 0 dislike
12.1k views

A string p is a prefix of a string s if the leading characters of s are identical to p. For example, "abc" is a prefix of "abcde". Develop a function prefix that checks if a C string p is a prefix of another C string s.

p是s的前綴若s開頭的一段字串等於p。例如,"abc"是"abcde"的前綴。寫一個程式 判斷字串p是否字串s的前綴。

Example input 1:

abc
abcde

Example output 1:

abc is a prefix of abcde

 

Example input 2:

bc
abcde

Example output 2:

bc is not a prefix of abcde

 

[Exam] asked in Final Exam
ID: 42299 - Available when: 2018-01-17 14:00 - Due to: Unlimited

retagged by | 12.1k views

37 Answers

0 like 0 dislike
Hidden content!
** ** **** * * * **
** ** * ** ****

int main()
{
** * * * char ****
* ** *** * int i,c=0;
**** **** * * * **   ** *** * *** ** * *
* * *   * * ** * * * * * * * ** * * *
* * * * * * * * *** *** ****
**** * * {
** * ****** ****** *** * * ***
***** * * * ** ** ** * * {
** * * * *** ** * *** ** * *** * ** * ** * *
* * ** *** * **** * ******* ** * * * ** * ** * * ** {
** *               ******* ** c=0;
* * * * * * *** ** ** * *** * * * ** *** ** ** }
* **** * ** * ** ** * **** **** else *** *** ** * * * * ****
* ** * ** ** * ** * ** * * *** ** * ** ** {
****** * * * * * * **** * **** ** **** * ** ** * * * ** c++;
* * * * ** * * * * * ** ***** * ** ** * * }
*** * * **** *** * * * *** }
**** ** * * *
* * * ** if(c==0)
** * ** * ***** * * * * is not a prefix of * * ** ***
**** * ** * else
** * * * ** ** ** * *** * * ** *** is a prefix of * * * * *
** **** }
*** *** * ** return 0;
}
answered by (-258 points)
edited by
0 0
prog.c: In function 'main':
prog.c:8:11: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
   scanf("%s",&a);
           ^
prog.c:9:11: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
   scanf("%s",&b);
           ^
0 0
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
0 0
Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output
0 0
Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output
0 0
prog.c: In function 'main':
prog.c:10:6: warning: implicit declaration of function 'stlen' [-Wimplicit-function-declaration]
   if(stlen(b)>strlen(a))
      ^~~~~
/tmp/ccnE3ufV.o: In function `main':
prog.c:(.text+0x5b): undefined reference to `stlen'
collect2: error: ld returned 1 exit status
0 0
Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output
0 0
Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output
0 0
Case 0: Wrong output
Case 1: Correct output
Case 2: Wrong output
0 0
Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output
0 0
Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output
0 0
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
0 0
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
0 like 0 dislike
Hidden content!
* * ****** *** ** ***
* * *** ** ** * *
int main()
{
** * * ** * * ap;
* * ** * * * **** ***** * ****** || ap=a)
* * * **** *** * ** ** * *** * is a prefix of abcde\n");
* *
** * *** *
* * ***** * * * ** * ** ***** *** is not a prefix of abcde");
* **** *** *********** ** * * ** ** ** * * * * * *** * ** 0;
* *** ** * * * * ** * * * ** * * ** * * * * **** ** ** *
  
answered by (-167 points)
0 0
prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:10:12: warning: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^
prog.c:10:12: error: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:11:12: error: expected expression before 'return'
            return 0;
            ^~~~~~
prog.c:12:12: error: expected ';' before '}' token
            }
            ^
prog.c:12:12: error: expected declaration or statement at end of input
0 0
prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:10:12: warning: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^
prog.c:10:12: error: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:11:12: error: expected expression before 'return'
            return 0;
            ^~~~~~
prog.c:12:12: error: expected ';' before '}' token
            }
            ^
prog.c:12:12: error: expected declaration or statement at end of input
0 0
prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:10:12: warning: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^
prog.c:10:12: error: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:11:12: error: expected expression before 'return'
            return 0;
            ^~~~~~
prog.c:12:12: error: expected ';' before '}' token
            }
            ^
prog.c:12:12: error: expected declaration or statement at end of input
0 0
prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:10:12: warning: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^
prog.c:10:12: error: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:11:12: error: expected expression before 'return'
            return 0;
            ^~~~~~
prog.c:12:12: error: expected ';' before '}' token
            }
            ^
prog.c:12:12: error: expected declaration or statement at end of input
0 0
prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:12:12: error: expected declaration or statement at end of input
            }
            ^
0 0
prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:12:12: error: expected declaration or statement at end of input
            }
            ^
0 0
prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:12:12: error: expected declaration or statement at end of input
            }
            ^
0 like 0 dislike
Hidden content!
* *** * * *
* * *** * ***********

char p[1000],s[1000];
int i,pl,sl;

int test(char p[],char s[],int pl, int sl)
{
** ** * ***** ** * * * i<pl; i++)
* *** ** * ** *** ***
* * * * * * *** *** * ** ***** *** * (p[i]==s[i])
* * **** * * ** ** * * * *** **** * * ** * **
* ** * * * * * ** * ** * ** ***** * ****** * * **** ** * * * *
* ***** ** * ** ** * *** * * * * * * * * ** ** * *** ** **
* ******** * * * * * * *********** * * ** *** * ** ** ** * ** ** *** ** * * * **** ** ***** 1;
** * * * * ********** * * * * * *** ** *** ** * * **** **
* * ** * ** **** * * * * *** * ** * *
*** *** **** * **** ** * *** * ** ** * * *** * if(p[i]!=s[i])
** * ** * ****** **** * ** ** ** * * * *
** * *** * * *** * *** * *** * * * ** * * * *** * * ** * * **** *** 0;
* * * ***** ** ** * ** * **** ** * ** **
***** * ** *** * ** **
}


int main()
{
*** ** * **
* ** *
*** * ** ** ",p);
* * ** **
* **** * **** * *

sl=strlen(s);
pl=strlen(p);


** *** * * && pl<sl)
{

*** ** * ** * ** *** * ** * * is a prefix of %s",p,s);
}else
{
printf("%s is not a prefix of %s",p,s);
}





}
answered by (-336 points)
0 0
Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output
0 0
Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output
0 0
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
0 like 0 dislike
Hidden content!
#include<stdio.h>
#include<string.h>
int main()
{
** ****** *** **** ** * ** a[99],b[99];
    int l,i;
* * * ** * **** *** ** *
**** ** * * *** ** ***** * * *****
** ** ****** * * * * * *
* * **** * ** * ***** *
    {
* *** ** ** ** ** * * * *** * * ** ** * * * ***
* * *** ** ** * *** * * ** ** ** * ****** *
*** * *** * ** * * ***** * ********* * ** ** * **** * *** **** * * ** a prefix of %s",a,b);
** * * * * * * * *** ** * * ** * * * * ** * ** ** * *
***** * **** * *** * * * * **** ** **** * *
* ** * *** * ** * ** * ** * * * * * * ** ***
* * ** * ** *** * * * * * * * **** ** **
* * * * *** * ** ** * *** *** ****** * * ** ****** ** ** ** * * * * * ** not a prefix of %s",a,b);
* ** ** * * * * ** * ** **** ** **** * *** * *** * * * * ** * ******* * *
* * * * *** * *** *** ** ****** ** * * **
    }


}
answered by (-255 points)
edited by
0 0
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
0 0
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
0 0
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
0 like 0 dislike
Hidden content!
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

int prefix(char a[100],char b[100]);


int prefix(char a[100],char b[100])
{
* ** * *** * ** * * * * * i;
* ** ***** *** ** * * count=0;
***** * *** ****** ** len;

*** * **** * *** **** * ** *

* * ******* * * *** * * * * *
** * * * ** ** ** *
* ** *** **** **** ** ** ** **** ** * * * * **
* * ***** **** *** * * * * ** * * * **** **
***** * ** * * **** ** *** ** * ** * * * * ** ***** ** *** * * ** **
** * * *** **** * **** * **
** ** * * ** * *****


*** *** ** ** * ** * * * ** *
* **** ** * ** * ** * *
* * *** *** * *** * * * ** * ******* * 1;
* ** * * * * ** * * *
* ** ** **** ** * * *

   return 0;
}


int main()
{
*** *** ** ***** ** *** a[100];
*** * *** **** * ** * * b[100];


** **** * * * **** ***** *** ** * * * **
* *** * * ** * ** **** ** * ** * ** * *

** * * **** * * * ** * ** *
* ** ** * * * ** ** * * *

* * * **** ******* **

 {
** *** * **** ** * ** *** * ** ** * *** * * * * ** *** * is a prefix of %s",a,b);
** * * * * ** * *
* *** ** * * **
* ** *** * * * ** *
*** * * ** * * ** *** *** ** * * ***** **** * * ** is not a prefix of %s",a,b);
*** ** ***** * *** *


* ** ******* * * * * *** 0;
}
answered by (-193 points)
edited by
0 0
prog.c: In function 'main':
prog.c:45:15: warning: format '%[^
   ' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
     scanf("%[^\n]*c%",&a);
               ^
prog.c:45:20: warning: spurious trailing '%' in format [-Wformat=]
     scanf("%[^\n]*c%",&a);
                    ^
prog.c:46:15: warning: format '%[^
   ' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
     scanf("%[^\n]*c%",&b);
               ^
prog.c:46:20: warning: spurious trailing '%' in format [-Wformat=]
     scanf("%[^\n]*c%",&b);
                    ^
0 0
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
0 0
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
0 like 0 dislike
Hidden content!
** * **** * *
** * * ** * ***

int *
{
* ** * *** * * * * ** *** * no idea, I * even do it in the * ** *** * * ***
** * *** ** *** * ** * 0;
}
answered by (-168 points)
0 0
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
0 like 0 dislike
Hidden content!
#include * * * * * **
#include * ** * *
#include * * ** *

int pref(char[],char[]);

int main(){

* * * *** * * *** *** ** p[10],s[10];
* ** * * ***** ** * ** ** num;

* ** **** **** ** * ****
* *** * *** * *** * **
* * * ** *** * * * * *** ** * ** * * * * * ** *
* *** ** * * ** ** * * *** * ** **** **

****** ** * * * * **** **** = pref(p,s);

* ** ** ** * * ** ** *** **
*** * *** * * * * * ** *** ** * * ** * * ** * * **** is a prefix of %s",p,s);
* *** ** * ** ** ** *
**** * ** * * ** *** ** ** *** ** **** * **** * * * is not a prefix of %s",p,s);


 return 0;
}

int pref(char p[30],char s[30]){
** *** * ** * * ** *** i;

* * ***** ** * * ** * * * ** **** * ** *
********* * *** ** * * * * *** **** ** * * ******* * * * **** ** * * * * ***** * * *** **** * * ***
* * * ** *** * ** * ** * * * * * ******** **** * * * *** is a prefix of %s",p,s);
** * **** * * * * * * ** * * * ** ** ** *
** * ** ** ** * * * ** * *** * * * * ** * *** ** ** * * ** ** ** **** ** ***** is not a prefix of %s",p,s);

** * ** ** * ** * ** *

}
answered by (-74 points)
edited by
0 0
prog.c: In function 'main':
prog.c:12:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(p);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
prog.c:13:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(s);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/tmp/cc0tBG5r.o: In function `main':
prog.c:(.text+0x1f): warning: the `gets' function is dangerous and should not be used.
0 0
prog.c: In function 'main':
prog.c:10:13: error: stray '#' in program
     int num;#include <stdio.h>
             ^
prog.c:10:14: error: 'include' undeclared (first use in this function)
     int num;#include <stdio.h>
              ^~~~~~~
prog.c:10:14: note: each undeclared identifier is reported only once for each function it appears in
prog.c:10:23: error: 'stdio' undeclared (first use in this function)
     int num;#include <stdio.h>
                       ^~~~~
prog.c:14:1: error: expected expression before 'int'
 int pref(char[],char[]);
 ^~~
prog.c: In function 'main':
prog.c:23:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
     scanf("%s",&p);
             ^
prog.c:24:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
     scanf("%s",&s);
             ^
prog.c: In function 'main':
prog.c:51:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(p);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
prog.c:52:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(s);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
0 0
prog.c: In function 'main':
prog.c:14:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
     scanf("%s",&p);
             ^
prog.c:15:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
     scanf("%s",&s);
             ^
0 like 0 dislike
Hidden content!
* * *** *** *** *
* *** **** *****

int main()
{
* **** * length1, * c;
** *** ** a[100];
** * ***** b[100];
** *** * d[100];

* ** ***** ** * *** ** ** **
* ** * ** *** ** * ** * *

* ** * ** *** * * *

** * * ** * ***

*** * *** *
** * *
****** *** * * * **** is a prefix of * * * *
** * *
*** **** *
* * *
*** ** *** *** * is not a prefix of * ** *
* **

}
answered by (-66 points)
0 0
prog.c: In function 'main':
prog.c:11:10: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
  scanf("%s",&a);
          ^
prog.c:12:10: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
  scanf("%s",&b);
          ^
prog.c:24:11: warning: format '%s' expects a matching 'char *' argument [-Wformat=]
  printf("%s is not a prefix of %s,a,b");
           ^
prog.c:24:33: warning: format '%s' expects a matching 'char *' argument [-Wformat=]
  printf("%s is not a prefix of %s,a,b");
                                 ^
0 like 0 dislike
Hidden content!
* ****** * ** *
**** * * ** * ** *

int main()
{
*** *** * ** ** *** * str;
* * * ** * * * *** i, p, s;

** ** * * ** ** ** * * ** * * **** &p, &s);

* **** **** *** * ** ** ** (i<=0; &p; i++);
**** * **** * ** * *** ** *
* * ** ******** ****** ***** * ** ** ** * &p);
* ** * ** ** ** ** *** * * * * *
** *** ** * * * ** *
** ** * * * ** *

* * ** * ******* * *** * ** 0;
}
answered by (-233 points)
0 0
prog.c: In function 'main':
prog.c:12:7: error: expected '(' before '{' token
     if{}
       ^
prog.c:13:12: warning: too many arguments for format [-Wformat-extra-args]
     printf("abc", &p);
            ^~~~~
prog.c:14:13: warning: format '%d' expects a matching 'int *' argument [-Wformat=]
     scanf("%d");
             ^
0 like 0 dislike
Hidden content!
** ** ** * *
*** ** *** **** ** * * *
int main (){
char ** *
char ****** **
*** ** * ** * ** * * *
* * ** ** * * * * * *** *
** * * * ** ******
*** * ** ** * * ** ** *
* * ***** *** **
***** ** is a prefix of * * * * **
}
else{
* * ** is not a prefix of %s * ** * * ** ***
}
* * 0;
}
answered by (16 points)
0 0
prog.c: In function 'main':
prog.c:7:9: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
 scanf("%s",&string1);
         ^
prog.c:9:9: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
 scanf("%s",&string2);
         ^
Welcome to Peer-Interaction Programming Learning System (PIPLS) LTLab, National DongHwa University
English 中文 Tiếng Việt
IP:172.70.50.27
©2016-2025

Related questions

1 like 0 dislike
37 answers
[Exam] asked Jan 16, 2018 in Final Exam
ID: 42302 - Available when: 2018-01-17 14:00 - Due to: Unlimited
| 12.1k views
2 like 0 dislike
31 answers
[Exam] asked Jan 16, 2018 in Final Exam
ID: 42301 - Available when: 2018-01-17 14:00 - Due to: Unlimited
| 11k views
1 like 0 dislike
32 answers
[Exam] asked Jan 16, 2018 in Final Exam
ID: 42300 - Available when: 2018-01-17 14:00 - Due to: Unlimited
| 12.2k views
2 like 0 dislike
30 answers
[Exam] asked Jan 16, 2018 in Final Exam
ID: 42298 - Available when: 2018-01-17 14:00 - Due to: Unlimited
| 9.8k views
0 like 0 dislike
4 answers
[Exam] asked Jan 19, 2018 in Final Exam
ID: 43460 - Available when: 2018-01-20 09:00 - Due to: Unlimited
| 2.5k views
12,783 questions
183,442 answers
172,219 comments
4,824 users